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A proposal for the evolutionary appearance of the mammalian and frog ALDH1B1 genes by retroviral integration of ancestral ALDH2 cDNA sequences. Proposed evolutionary appearance for the single coding exon ALDH1B1 gene derived from a retrovirally induced integration of ALDH2 cDNAs and the subsequent integration into another chromosome within an ancestral vertebrate genome; ALDH2 and ALDH1B1 gene structures were derived from AceView.
